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Analog Devices Inc. LT8616EUDE#TRPBF
- Part No.:
- LT8616EUDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8616EUDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A/2.5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,432
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Product details
Overview
LT8616EUDE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous monolithic step-down DC/DC regulator in a 28-lead 3mm × 6mm QFN package, delivering 1.5A on Channel 1 and 2.5A on Channel 2 with input voltage range 3.4V to 42V, 6.5µA quiescent current in Burst Mode, and 35ns minimum on-time. It powers automotive infotainment and industrial control rails requiring high efficiency at ultra-light loads.
For engineers reviewing the LT8616EUDE#TRPBF datasheet, LT8616EUDE#TRPBF pinout, LT8616EUDE#TRPBF application, or LT8616EUDE#TRPBF equivalent, key selection criteria include dual independent enable pins (1.03V threshold), 180° out-of-phase switching for reduced input ripple, programmable 200kHz–3MHz frequency via RT resistor, ±10% power-good monitoring per channel, and BIAS pin support for improved light-load efficiency.
Technical Context
The LT8616EUDE#TRPBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small external inductors. Its dual-channel architecture features independent EN/UV pins, TR/SS pins for soft-start and tracking, and SYNC/MODE pin supporting Burst Mode (low IQ), pulse-skipping, or external clock synchronization.
Each channel integrates top and bottom NMOS switches (310mΩ/190mΩ for CH1; 145mΩ/120mΩ for CH2), supports separate VIN1/VIN2 inputs, and delivers regulated outputs referenced to a precise 0.790V internal FB voltage. The device operates across –40°C to +125°C junction temperature and includes thermal shutdown, overcurrent protection, and undervoltage lockout on both inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery and industrial supply variations without pre-regulation |
| Output Current | CH1: 1.5A, CH2: 2.5A - enables independent powering of logic and I/O rails with different load profiles |
| Quiescent Current | 6.5µA (both channels active, Burst Mode) - sustains >10-year battery life in always-on automotive modules |
| Minimum On-Time | 35ns - allows high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse skipping |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - balances inductor size vs. efficiency for space-constrained designs |
| FB Reference Voltage | 0.790V ±12mV - enables accurate output regulation with standard resistor dividers and low divider current |
| Power-Good Threshold | ±10% of VOUT - provides reliable rail sequencing and fault detection without external comparators |
Pinout & Package
LT8616EUDE#TRPBF uses a thermally enhanced 28-lead 3mm × 6mm plastic QFN package (UDE) with exposed GND pad soldered to PCB for θJC(PAD) = 5°C/W. Pin functions are validated per Linear Technology's official LT8616 datasheet Rev. FA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Channel 1 input supply | Mandatory ≥3.4V source for internal bias and CH1 switch; must be present even if only CH2 is used |
| VIN2 | Channel 2 input supply | Supplies CH2 top switch; can be tied to VIN1 but supports independent sourcing up to 42V |
| EN/UV1, EN/UV2 | Independent enable/undervoltage inputs | Hysteretic 1.03V rising / 0.98V falling thresholds allow precise UVLO programming with resistor dividers |
| FB1, FB2 | Feedback inputs | Regulated to 0.790V reference; connect resistor dividers to set VOUT1/VOUT2 with <0.1% line/load regulation |
| PG1, PG2 | Open-drain power-good outputs | Assert low until corresponding VOUT is within ±10% of target - enables safe system power sequencing |
| TR/SS1, TR/SS2 | Soft-start/tracking control | 2µA internal pull-up charges external capacitor for controlled ramp; also accepts external voltage for output tracking |
| SYNC/MODE | Mode selection & synchronization | Ground = Burst Mode; ≥2.4V = pulse-skipping; AC clock = synchronized operation with 180° phase shift between channels |
| BOOST1, BOOST2 | Bootstrap supplies | Drive top NMOS gates above VIN; require 0.1µF ceramic caps placed directly between BOOSTx and SWx |
| GND | Power and signal ground | All GND pins plus exposed pad must be connected to common ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Enables simultaneous 5V/3.3V generation with separate input, enable, and PG signals - eliminates need for two discrete converters |
| Ultralow 6.5µA quiescent current | Extends battery runtime in always-on systems (e.g., telematics, ADAS sensors) without sacrificing regulation accuracy |
| 180° out-of-phase switching | Reduces RMS input ripple by ~30% vs. in-phase operation - lowers required input capacitance and EMI filtering |
| Internal compensation | Eliminates external compensation network - simplifies layout, reduces BOM count, and ensures stability across all operating conditions |
| BIAS pin support | Allows sourcing gate drive and bias current from VOUT (≥3.1V), reducing VIN1 loading and improving light-load efficiency |
| Robust fault protection | Includes thermal shutdown, valley/peak current limiting per channel, and input UVLO - prevents damage during overload or cold-cranking events |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering display controller (5V) and interface ASIC (3.3V) in head-unit under 12V battery with cold-crank dips to 3.4V. IC Role / Device Role / Timing Role: Dual buck regulator providing isolated, sequenced, and monitored 5V/3.3V rails with independent enable and PG signaling. Use Value: 6.5µA IQ maintains MCU wake-up capability during ignition-off; 35ns min on-time sustains regulation during 42V load-dump transients. | Use Scenario: Generating 5V logic and 3.3V sensor interface rails in DIN-rail mounted PLC with 24VDC input and strict EMC requirements. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering tightly regulated, low-noise dual outputs with 180° phase shift to minimize conducted EMI. Use Value: Integrated soft-start and tracking (TR/SS) enables glitch-free power-up of FPGA and ADC; ±10% PG ensures deterministic firmware boot sequence. |
| Medical Portable Monitor | Ruggedized Telematics Unit |
Use Scenario: Battery-powered patient monitor requiring 5V for microcontroller and 3.3V for wireless transceiver, with >5-year shelf life. IC Role / Device Role / Timing Role: High-efficiency dual regulator managing Li-ion battery discharge (3.4V–4.2V) while maintaining stable outputs across full SoC range. Use Value: Burst Mode IQ of 6.5µA extends standby time; BIAS pin connection to 3.3V rail reduces total system IQ by 40% vs. VIN-only biasing. | Use Scenario: GPS/cellular telematics module in fleet vehicle exposed to -40°C to +125°C ambient and 42V load-dump surges. IC Role / Device Role / Timing Role: Automotive-grade dual buck supplying core processor (5V) and RF front-end (3.3V) with AEC-Q100 stress-tested reliability. Use Value: Guaranteed operation from –40°C to +125°C; integrated UVLO on both VIN pins prevents brownout during cranking; exposed-pad QFN ensures thermal robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3375EFE#TRPBF | Octal 150mA configurable buck (not dual high-current); 2.5µA IQ; requires external compensation | Better for multi-rail low-current systems (e.g., sensor nodes); lacks 2.5A CH2 capability and 42V input | Select when needing >2 output rails with fine-grained current allocation, not high-current dual outputs |
| TPS6521905RGER | Single 4.5V–18V input, dual 3A/2A outputs; 15µA IQ; no BIAS pin; fixed 5V/3.3V or adjustable | Optimized for USB-C PD sink applications; narrower input range excludes 24V/42V industrial use | Select for cost-sensitive consumer electronics with ≤18V input and no requirement for ultralow IQ or 42V tolerance |
Compared with LTC3375EFE#TRPBF and TPS6521905RGER, the LT8616EUDE#TRPBF uniquely combines 42V input tolerance, 2.5A high-current Channel 2, 6.5µA IQ, and BIAS pin flexibility - making it the only option for automotive and industrial dual-rail systems demanding wide Vin, high current, and battery longevity.
Availability
LT8616EUDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, medical portable monitors, and ruggedized telematics units requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8616EUDE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification.
The LT8616EUDE#TRPBF belongs to the LT86xx family of ultralow-IQ synchronous buck regulators designed specifically for always-on systems in automotive, industrial, and medical applications where battery life and input voltage resilience are critical.
FAQ
What is the guaranteed operating temperature range for the LT8616EUDE#TRPBF?
The LT8616EUDE#TRPBF is specified for operation from –40°C to +125°C junction temperature, verified per Analog Devices' industrial-grade qualification standards. This range covers under-hood automotive environments and industrial control cabinets without derating. The UDE QFN package's exposed thermal pad must be soldered to PCB copper for thermal compliance.
Can the LT8616EUDE#TRPBF regulate both outputs from a single 12V input?
Yes, the LT8616EUDE#TRPBF supports independent regulation of both channels from a shared 12V input. VIN1 and VIN2 can be tied together, but VIN1 must remain ≥3.4V at all times - even if only Channel 2 is active. This configuration is validated in the typical application circuit (Figure TA01a) with 12V input delivering 5V/1.5A and 3.3V/2.5A simultaneously.
How does the BIAS pin improve efficiency in the LT8616EUDE#TRPBF?
The BIAS pin on the LT8616EUDE#TRPBF allows internal gate drivers and bias circuits to draw current from a regulated output (e.g., VOUT2 = 3.3V) instead of VIN1, reducing input supply current by up to 7mA under full load. When connected to ≥3.1V, BIAS lowers overall system IQ and improves light-load efficiency - especially beneficial when powering multiple rails from a single battery source.
What is the purpose of the TR/SS pins on the LT8616EUDE#TRPBF?
The TR/SS1 and TR/SS2 pins on the LT8616EUDE#TRPBF serve dual functions: soft-start control (via external capacitor) and output voltage tracking (via resistor divider from another rail). An internal 2µA current source ramps the TR/SS voltage; the FB pin follows this ramp until it exceeds 0.790V, then transitions to regulation. This prevents inrush current and enables controlled power-up sequencing between 5V and 3.3V domains.
Does the LT8616EUDE#TRPBF support synchronization to an external clock?
Yes, the LT8616EUDE#TRPBF supports external clock synchronization via the SYNC/MODE pin. Applying a TTL/CMOS clock signal (250kHz–3MHz) aligns Channel 1's positive edge to the clock's rising edge and Channel 2's positive edge to the falling edge - ensuring 180° phase separation. This feature reduces beat frequencies and EMI in multi-converter systems while maintaining pulse-skipping mode operation.
LT8616EUDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 41.8V
- Current - Output:
- 1.5A, 2.5A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (3x6)
LT8616EUDE#TRPBF FAQ
1.How can I place an order for LT8616EUDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616EUDE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8616EUDE#TRPBF reliable?
The price and inventory of LT8616EUDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616EUDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8616EUDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616EUDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616EUDE#TRPBF?
LT8616EUDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616EUDE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8616EUDE#TRPBF?
For technical support, including LT8616EUDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616EUDE#TRPBF requirements.
6.How does Aetrix verify that LT8616EUDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8616EUDE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8616EUDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8616EUDE#TRPBF?
All LT8616EUDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616EUDE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8616EUDE#TRPBF part is unused and in its original packaging.
Return procedure for LT8616EUDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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